<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>内容隐藏</title>
		<style type="text/css">
			.h2{
				display: none;
			}
			.h4{
				display: none;
			}
			.h6{
				display: none;
			}
		</style>
	</head>
	<body>
		<h1>标题一</h1>
		<h2 class="h2">标题二</h2>
		<h3>标题三</h3>
		<h4 class="h4">标题四</h4>
		<h5>标题五</h5>
		<h6 class="h6">标题六</h6>
	</body>
</html>
